Champs League loss to Borussia Dortmund reveals Arsenal weaknesses

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Robert Lewandowski struck in the 82nd minute to pick up a key 2-1 victory on the road for Dortmund.

Robert Lewandowski struck in the 82nd minute to pick up a key 2-1 victory on the road for Dortmund.

This, though, perhaps was a useful reminder that, as well as things are going for Arsenal, the squad is perhaps still a couple of players light.